klausmeyer



April 1929'. D. c. KLAUSMEYER I 1,708,420

MONOARM CONTROL Filed Nov. 27, 1926 5 Sheets-Sheet l avwemtoz 5) nd K 35 Game;

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April 1929- D. c. KLAUSME'YER MONOARM CONTROL Filed Nov. 27, 1926 5 Sheets-Sheet 2 avwemtoz Apr-i1 9', 1929. D. c. KLAUSMEYER MONOARM CONTROL Filed Nov. 27, 1926 5 SheetS Sheet avwau coz W Patented Apr, 9, 1929..

UNITED fiTATES ereu'r Fries.

DAVID C. KLAUSMEYER, F CINCINNATI, OHIO, ASSIGNOR TO THEQINCINNATI BECK- IEORI) TOOL COIVEPANY, C-IF CINCINNATI, OHIO, A CORPORATION OF OHIO.

MGNOARM conraoii.

Application filed November 2 Various types of machine tools include a member required to beadjusted to various positions on a supporting element and securely locked theretorduring a machining 5 operation. A radial drill is a good example 01" a machine tool of that nature, the radial arm constituting; the member required to be djusted and locked and. the usual upright sleeve or colunm constitutingthe supporting elemen he adjustment of the arm length wise of the column is usually OilGClGCl by means or a screw supported lengthwise of the column and a cooperating nut carried by the arm; one of said elements being rotater relative to the other by suitable power means.

In large size radial drills the radial arm is a ponderous element feet in length) which, with the usual drill head carried thereby, weighs thousands of pounds. The contact between the elevating screw and nut prevents the arm from falling bocily when iinlocked from the column but because of the fact that the arm extends almost wholly to one side of the column, the weight of the arm, and drill-head carried thereby, tends to move the outer end of the arm downwardly in an arc about a fulcrum point located at the juncture of the lower edge of the arm and the side of the column to which the arm ertencs. Due to the weight of the ar 1, and the parts carried thereby, andturther due to the great leverage allorded by the length of the arm, a great lateral pressure exerted on the column at the fulcrum point or the arm. This pressure forces the arm info contact with the column at the fulcrum pointand produces slack between the arm'aud the column diametrically opposite the fulcrum point. Likewise the downmird movement of the outer end of the arm about the fulcrum point pulls the upper portion ot'the arm away from the column at the side adjacent the arm and draws the diametrically opposite portion of the arn lirmly into contact with the column, thus effecting E-substantially a two point contact between the arm and the column, which two points are at diametrically opposite sides of the column and at the upper and lower sides of the arm. This is the condition that exists when the arm is unclamped from the column to permit vertical adjustm lt thereof. it will readily be perceived 7, 1928. Serial No. 151,062.

that, with this relation between the arm and column, should a drillm operation be attempted back pressure or the work on the drill would cause the outer end of the arm to be moved upwardly about the fulcrum point and this movement would shift the drill laterally and destroy the precision of the machine. Therefore, it is essential that prior to a drilling operation all slack be tween the arm and column be taken up and the two become, in effect, a unitary structure. This is preferably effected by suitable clamps which serve to draw the slack sides of the arm into contact with the column and then securely to lock the two together. Inasmuch as this drawing together of the arm and column may necessitate lifting; the whole arm about its fulcrum point it will be appreciated that this'operation may require the application of greatpower.

To effect a complete and satisfactory clamping of the arm to the column it has been found desirable to utilize a plurality of spaced clamping devi es. Due to the oppositely directed pressures exerted by the arm on the column it will readily be perceived that when the clamps are located at the same side of the column (tor example at the side diametrically opposite that to which the arm extends) they will have substantially unequal amounts of work to perform, e. the upper one will be required to lift the arm and drill head until the arm and column at the side opposite the clamp are" firmly in contact and then to clamp the two together, whereas'the lower clamp, being located at the point where the weight of the arm produces slack between the arm and column, is merely required to clamp the two together. It is also essential that ultimately both clamps be completely set so that there can be no possibility of movement between the arm and column.

Inasmuch as the translating means For the arm is power actuated, it is essential that the clamps be completely released before the translating means is rendered ei'lective and likewise that power be disconnected from the translating means before the clamps are again closed. Qtherwi e one force would be acting against the other which would result in breakage of the parts. I

This invention relates to clamping and translating mechanisms the typehereinbefore described and it has for an object to provide a singlecontrol for-both the translating mechanism and the clamping mechanism and so to construct the control that overlapping in the actions of: the two -mechanisms will bc'-=posit ively precluded.

Another object of the invention is toprovide improved means for actuating aplir rality of unequally resisted clamps whereby they may all be completely tightened by the manipulation of a single elementand by substantially less power than has been required to operate prior devices.

'Stillanother object is to overcome shocks and jars in the machine when'the power is applied to translate the arm and to provide improved mechanism for this purposewhich is adapted to be actuated by-thesingle lever which also actuates the arm clamps.

These ob 'ects have been attained by the provision of a single lever adapted to actuate a plurality of clamps when the lever is given one movement and also adapted to control the action of the translating mechan-ismv when given another movement, to-

g'eth'er with controlling means for the lever which require's'that it be given anintermediate movement between successive translatingandclamping movements. his intermediate movement insures that the mechanism previously connected with the lever will be disconnected therefrom before the other mechanism may be connected thereslight 'mits great power. This power delivered by with thus precluding overlapping of action the screw and nut maybe received and fur-' 'ther multiplied by suitable levers which. opcrate individual clamps.

To transmit to the clamps power in pro portion to the amount of work to be performed by the individual clamps, unequal power multiplying connectionsmay be provided between the actuating lever and the clamps. This conveniently may be effected by the provision of clamp actuating levers of unequal lengths'and actuating=them all from the common actuating lever.

Equalizing means also is provided. be-

tweenthe clamps to insure that all of the clamps ultimately will betieghtened equally.

The improved means for eliminating tion.

shocks and jars when power is applied to the arm translating mechanism preferably includes friction clutches Which may be engaged gradually by the manual manipula' tion of" the single control lever.

Other objects and advantages will be in part indicated in the following description "and in part rendered apparent therefrom in connection with the annexed drawings.

To enable others skilled in the art so fully lating controllin mechanism. Fig. 3 is a v side elevation or the mechanismshown in Fig. 2, looking in the direction indicated by the arrows 3, the motorsupporting bracket, later to be referred to, being shown in sec- F 4; a horizontal section on the line 4-4 of Fig. Figs. 5 and 6 are sections on the lines 55 and 6-6 respectively of Fig; 4. Fig. showing the means for 'rotating'the arm translating nut: from the usual armshaft, to effect vertical adjustments of the arm. Fig. 8 is a vertical section substantially on the line8-8 of'Fig. 7. Fig. 9 a'detail View showing the means. for controlling the movements of the actuating lever. 10 is a detail view illustrating; the action of two safety power throw-off devices adapted au tomatically to limit the extent of translation of the arm.

Referring more particularly to the drawings. the invention is disclosed as embodied ina radial drill comprising the usual base l. column 2, radial arnr?) and drill head 4 adjusta'bly mounted onthc arm. In the type of radial drill illustrated the column comprises a vertically disposed post 5 se cured to the base and a sleeve 6 rotata'bl'y :nipp'orted upon the post, but it is to be un derstood that this invention is not limited to this type of radial drill. The arni is rendered rotatable relative to the post'by be,- ing secured to the rotatable sleeve 6, whereby the arm'may be moved horizontally to position a drill point (not shown) carried by the usual spindle S relative to a work-piece supported upon the base 1.

s eeve togetherafter the desired horizontal 7 is a horizontal section A suitable clamp is providedfor locking the post and ing forms no part of the present invention" and it will therefore suffice to say that it may be actuated by the lever 7 shown 1n Fig.

1. .he arm is preferably formed with a girdle portion 8 which embraces the sleeve 6 and which is vertically movable thereon to'permit vertical adjustment of the arm and drill-head as hereinbefore mentioned. Projecting from the girdle 8, at the side oppo site to that to which. the arm 3 extends, is a bracket 9 adapted to support a motor M from which power may be taken to rotate and translate the drill spindle and to translate the arm vertically on the column 2 as will hereinafter be more fully described. It is to be understood, however, that this invention is not limited to a radial drill in which the prime mover is carried by the arm but is likewise adaptable to radial drills in which the power enters themachine atthe base of the column, flows upwardly therethrough and then to the various operative parts of the machine tool. It is also adaptable to machines other than radial drills.

As hereinbefore explained it is frequently necessary, to adjust the arm vertically on the column prior to a drilling operation. This conveniently may be effected by power from the motor M acting through the mechanism shown in Figs. 7 and 8. Extending lengthwise of the column 2 and secured in bosses 10 on the sleeve 6 (or otherwise) is a threaded shaft 11 which has a threaded connection with a nut 12 supported in a bearing 13 carried by the arm 3. The weight of the arm, and its attached parts, is supported by the nut 12 in suitable or preferred manner. To permit the parts readily to be assembled and also to permit the nut to be freely rotatable even when it is supporting the weight of the arm, the arm may be supported upon the nut in the manner shown in Fig. 8 in which the nut is shown as provided with an upper horizontally disposed wall 14 upon which is seated an anti-friction thrust bearing 15. A bushing 16, removably secured to the arm as by means of screws 17 (only one of which is shown), rests upon the upper side of the thrust bearing and transmits to the bearing and nut the weight of the arm. A normally strain-free safety nut 18, adapted to support the arm should the threads of the nut 12 fail, may be located intermediate the nut 12 and the bushing 16. c

From the foregoing it will be perceived thatrelative rotation between the nut 12 and screw 11 will effect vertical adjustment of the arm. This relative rotation may be effected by maintaining the screw non-rotative and rotating the nut thereon; the direction of rotation determining whether the arm will be elevated or depressed. Rotary motion is preferably (but not necessarily) transmitted to the nut from the shaft'lO extending lengthwise of the arm. To that end a gear 19 is secured to thenut and this gear is driven by a smaller gear 20 rotatably keyed to rotate with a bevel gear also located within said casing. This bevel gear is adapted to be rotated in either of two directions by means of its engagement with similar gears 26 and 27 rotatably ournaled about the arm shaft 10 and adapted selectively to be clutched thereto by means of friction clutches 28 and 29 respectively. Selective engagement of the clutches 28 and 29 may be effected by a clutch actuating member secured upon a shaft 31 and adapted to be oscillated by a lever 32 which in turn is shifted by endwise movement of a link 33 later to be referred to.

It has already been explained that the arm must be unclamped from the column when the arm is given its vertical movements and that it must again be securely clamped to the column after the adjustment has been effected and before a subsequent drilling operation is begun. hen the arm is unclamped from the column there exists a slight space between the two and the weight of the arm and the drill-head carried thereon tends to move the outer end of the arm downwardly and inwardly as indicated by the arrow at, about a fulcrum point 7 (see Fig. 1) located at the juncture of the arm and column at the lower side of the arm. This inward pressure moves the lower portion of the girdle to the left viewed in Fig. 1) as indicated by the arrows 5 thereby taking up the playv between the arm and column and bringing the two forcibly in contact at the fulcrum point and producing slack between them at the diametrically opposite side of the column, as at 0. The upper end of the girdle is moved in the opposite direction, as indicated by the arrows (Z, thereby bringing the girdle and coluinn into contact at the point e, and producing slack at the opposite side, as at g.

In drills of the type herein described the girdle is usually split lengthwise as shown at 34 in Figs. 3 and 4t and a plurality of clamping devices serve to contract the split girdle first to take up the slack between the girdle and the column (which necessitates slightly elevating the arm and drill-head about the fulcrum f) and then to bind the girdle and column tightly together.

This invention provides improved means for accomplishing this result and also for selectively actuating the clutches 28 and 29 by the manipulation of a single lever 35. At opposite sides of the split 34- and at opposite ends thereof, the girdle is provided with lugs 36 and 37. Screws 38, passing freely through apertures in one end of said lugs and hav ng their heads .39 1n contact th relit) with, "are' tlneadecNinto-the other ofsaid lugs, and serve to limit the expansion of the girdle. To effect contraction oft the girdle, dr aw bolts4'0-and 41 arepassed through the lugs 36 and 37 and are provided'at one'end with nuts 42 and 48,-respectively, bearing against one of said lugs. Lock nuts Hand 45 are also threaded on the bolts l and 41 behind the nuts 42 and 43 and serve to maintain" them in any position of adjnstn'ient on said bolts. The opposite end of the bolts 40 and 41 are formed as eyesthrough which pass pivot pins 46 and 47-for "connection with clamp actuating levers 48 and 49 telci'funied'uponthe-rounded heads of pins 50 and SP'eac-h secured in one of said lugs. Tl'ie'draw bolt iO,-nut42 and lever (i8 form a first clamp designated generally as A and the bolt 41, nut 4.3"and 1ever4t9 constitute a second clamp designated generally as B.

It will be pe"cei-ved"that inasmucl-i as the clamp A isrequi ed to take up the slack at caused by the weight of the arm and drill head and also to contract-the split girdle whereas the clamp B is located at the slack side of the girdle and therefore is required only to contract the girdle the work to be performed by the former is much greater than the work to'be performed by the latter. This invention provides improved; means whereby, upon manipulation of a single lever, power may be transmitted to the two clamps in proportion to the amount of work to be performed; or, in. other words, in proportion to the resistancef This is attained by the provisiohpi unequal power-multiplying'connectlons between the common actuat- "ing lever and the individualclamps. This unequal distribution'ot power is preferably 511) eifected b I havi.n- 'r:tl1e levers 4:8 and 459 constructed and arranged to p'rfoduce substantially unequal leverage and then applying poi'ver of subs'ant-ially uniform value thereto. The free ends olithe levers'iS and 49 ablyjournaled in housing 51 supported by the armand preiierablydiy the motorsupporting bracket v Suitable portals 418* and ii) are provided in tlf'liohsing 51" to admit the tree cnds of the leversi8 and if reep'ectiw i The shaft 50 has a pivotal connect. a with'the actuating lever which latter carries a ball stud 53 tracking an annular roove Si in a header) secured to the ho: :ing 51. By n'ieans' ol this construction l't ation of the lever 35 about the ol rthes raft 50 'lil'rewise; rotates the shaft and'movein em of the r toward ainllron'i the columns the shaft cndwise, the

lllil tlli hall 53 in the 'slot 5e eonstitutingfa fulcrum for the lever 'Tra ttably but non-rotatably 'inonnted within the housing 51, as by 'means of splinesb'tl fitted into grooves 57 in the hot g, are nuts 58 and59 whichhave s threaded engagement with right and "left are bifurcated and straddle ashal t 50 rotat niechamsmsl The interi'ial periphery o'f'the c-l grooves.

nialed on the shaft-"50 [and is restrained against axial movement thereon by being.

:ig waaeo I threaded screws'60 and 1 rotatablewith the shaft '50 but slidable relative thereto as by means of splines 62. lVashei's 63 and Mare interposed between the nuts 58 and hi) and the free ends of the levers i8 and A9 respccducing andl'orce multiplying device which deliver tosaid levers great force from a lower 'l'orce manually applied to the shaftv 1eevcr 0. 1s 'orce is or; er in 1 tie h, tl l 3" Th i f h ll plied by'the levers-i8 and 49. The lever and-the parts associated therewith' 'areso constructed and arranged that the lever may be given'substantially a-c'omplcte rotation whereby; due to the length and range of "movement of the lever and the force multi-' is attached to and projects; upwardly from a collar- 66 secured to one end of a: bushing; (57 which in turn is-rotatably journaled in the-rear end of thehousing 51' and is held against axial movement therein by means of zrdogr-point screw 68 fitted into an annular groove 69 lh thje perij ihery'of'the bushmgJ The bushing (Wand collar 66 are, at'certain times, rotated by theshaft as will later be explained 'lhis' inventionfiirther pro rides means for positively insuring that the arm translating means and'the arm clamp- The link is iii}; means will never befeilective sirriulta-.

- neously nor will their action overlap the slightest extent although rotary movement of theshait 50 rs utilized to actuate both bushing 67' is provided with a series oi grooves 69- adapted at oei' tai'ntimes to re sh-aft 5t), and asec'ond series of grooves 72 permanently engaging splines 73 lormed'on a sleeve 74. A clearance space""72 is procd between the first and second-series The sleeve 7e is loosely-jourheld between a shoulder 75 on the she ftand the collar 71 secured thereto; The sleeve 74: also provided with a flange 7 6 formed with projections 77, in the nature of splines,

which, zit-certain time'sengag'e the grooves 57 in the stationary housing and thereby prevent rotation ofthe'sleeve 74 and bushingl67. 1 Y a r t has already been explained that both lso Lit

the arm translating mechanism and the arm clamps are actuated by rotary movement of the shaft 50. It is to be noted however that rotation of the shaft 50 actuates the arm translating mechanism only after the lever has been moved to its innermost position as shown in full lines in Fig. l-

ing 67 and arm will be moved counterclockwise thereby pulling on the link 38 and engaging the clutch 28 and causing the arm to be moved upwardly on the column. Should the lever 35 be moved downwardly from the position shown in full lines in Fig. 2 to the position 35 the above mentioned parts will be moved in the opposite direction and the clutch 29 will be engaged thereby moving the arm downwardly. As shown in Fig. 9 the lever 85 moves in a slot 78 in the head 55 when actuating the trans lating mechanism and this slot limits the movement of the lever to the positions 35 and 35. It is to be noted that the oscillatory movement of the shaft 50 to actuate the clutches 28 and 29 is very slight and the clamp actuating mechanisms are so designed that this slight movement does not have any appreciable effect on the clamps therefore the clamps are not actuated by the shifting of the clutches.

Intermediate its ends the slot 78 is intersected by a transverse slot 79 which, when the lever 35 is in its full line position (Fig. 2) i. c. with both of the translating clutches released, permits the lever to be moved outwardly from the column to the position shown in dotted lines, Fig. 1. This movementof the lever about its fulcrum 58-541 causes the shaft 50 to be moved axially in the lirection of the arrow t thereby with drawing the splines from engagementwith the grooves 69 and 69 and into the clearance space 72 and disconnecting the shaft 50 from the bushing 67 so that the shaft may be rotated. without actuating either of the clutches 28 and 29. This axial movement of the shaft 50 and the sleeve 7% thereon also causes the splines 77 on the flange 76 to engage the grooves 57 in the stationary housing 51 which, together with the engagement of the splines 73 with the grooves 72 in the bushing 67, serves to hold;

the bushing against rotation and precludes actuation of the arm translating clutches. lVith the arm translating means thus rendered inoperative the operator may swing the lever clockwise nearly a complete rotation to the position 85 indicated in dotted lines in Fig. 2 wherein the lever abuts against a lug 80 provided by the head 55. This rotary movement of the lever 35 acts through the screws 60 and 61, nuts 58 and 59 and levers 48 and 49 to tighten the clamps A and B as hereinbefore explained. After the clamps have been closed the translating mechanism may not again be rendered effective until the lever has been swung counterclockwise to the position shown in full lines Fig. 2 (which movement releases the clamps) and again moved horizontally through the slot 7 9 into the slot 78. A collar 81 secured to the shaft 50 is adapted to engage a port-ion of the head 55 to limit the movement of the shaft in one direction and engagement of the collar 71 with the collar 66 limits its movementin the opposite direction.

Safety devices also are provided to limit the upward and downward movement of the arm 3. These devices prefeably comprise collars 82 and 83 secured upon a rod 84 carried by the sleeve 6 and arranged in the path of a projection 85070. the lever 35 when the lever is in position to effect translation of. the arm. Should the operator set the lever to elevate the arm and neglect to discontinue the upward movement of the arm the collar 82 will contact with the projection 85 and force the lever 35 downwardly into its intermediate position, which movement will disengage the clutch 28 and bring the arm to rest. The collar 83 operates ina reverse manner when the arm is moved downwardly. Due tothe fact that the screws (50 and 61 andnuts 58 and 59 are free to move axially of the shaft 50 they afford an equalizing device between the clamp actuating levers i8 and 49 whereby, should one of the clamps tighten before the other, the screwsand nuts will move bodily toward the lever of the looser clamp. By means of this erpraliaing device a complete setting of both of the clamps is ensured.

ll ithout further analysis, the foregoing will so fully reveal the gist of th? invent )11 that others can, by applying current knowledge, readily adapt it for various utilizations by retaining one or more of the features that, from the standpoint of the prior art, fairly constitute essential characteristics of either the generic or specific aspects of this invention and, therefore, such adaptations should be, and are intended to be comprehended within the meaning and range of equivalency of the following claims.

Having thus revealed this invention, 1 claim as new and desire to secure the following combinations and elements, or equivalents thereof, by Letters Patent of the United States:.

1. A. machine tool combining a support; a member adapted to be translated relative to said supportiandt to ib8=ClllTlPOCl thereto;

translating mechanism :forsaid. member clamping mechanism for said member; a] single lever pivotal'ly secured in place and adapted selectively to beconnected to botlr of said mechanisms, said lever being movable in one plane to control one ofsaidlmechae nisms and movable in another planeto con-j tro l the other. 01" said mechanisms;..and .means requiring the lever to be moved in a third plane to insure total disconnection 01" the lever from one of said 2; echanisms before it is connected with the other ll'lGCllillllSll'h;

2. A machine tool combining a support; member adapted to be translated relative to said support and to be clamped thereto;

translating mechanism for said member; a

rotatable and translatable shaft adapted by its rotation alternately to actuate said mech= .anisms, said shaft being permanently connected with oneof said mechanisms and. adaptedby its .translatory movement to be: connected to the other of said mechanisms;

manual means to rotate. and. translatesaid shaft; means controlling the-actionot said manual means to limit therotation of said shaft to a small fraction of? axrotation when in one axial position and. to permit a materially greater rotation when in another axial position; means actuated bythe lesserrotationto control one of said mechanisms; and means actuatedby the greater :rotation to control the other of said mechanisms.

3. A machinetool combining a support; a member adaptedto be clamped thereto; a plurality of clamps for securing said memb er" to said support; a manually rotatable.

shaft; power multiplying gearing actuated by said shatt; and clamp closing levers actuated by said gearing, one of said levers being of? greater length whereby a greater multiplying device to transmit to f said clamps power in unequal amounts.

5. A radial drill. combining a column; an-

arm providodwith girdle surrounding said column, said girdle being split lengthwise at the side Opposite to that from which the arm projects; clamping means adjacent the upper and lower ends of said girdle and positioned on opp site sides of the split opening for contracting said girdle into binding relation with said column; a single manually actuated lever rotatable-in a substantialvertical plane adjacent the girdle for actuatin said clam lia -and uneo'ual power transmitting .means connectingsaid manually actuated lever XVi-llllSttlCl "clamps;

'support; a stationary housing a shaft r0 .tatably. andtranslatably yonr-naledin said 6. A radial drillcombining a 0Oll1l1111f.3112 arm supported by said column. andprojeeting" laterally therefrom; two vertically spaced clamps. for securing the 5 arm to the column, the upper clamp. being normally. forced apart by the weight of said projecting arm; a inemberextending transversely of said girdle; a manually operable lever. movable in a substantiallyverticalplane and connected. to said member; apconnection fron'iisaid member to the lower one of s'aid clamps. to transmit to said clamp power sutticientto cause it .to grip said column; and power transmitting means. connecting. said member with the upper one of saidi se. elampsr-to. tX'HI1SIIIlt21tl1Gl'GtO substantially greater powerthan is transmitted to; the lower clamp. r 7. A radial drillcombining a column; an:

arm adapted to be secured "thereto; translating mechanism for said arm; clamping mech-' anism for said arm; a manually actuable lever adapted selectivelyandalternately to be connected-with said mechanisms; said lever being movable a slightexie'nt in one plane j to actuate one oi said mechanisms and mov able in plane parallel to the firstnamed plane a greater extent to actuate the otherof said mechanisms; and means requiring said 1' lever to be brought to a position wherein one. of said mechanisms is rendered completely ineffective before tlielever may actuate: the other said-mechanisms. e

8. A clamping mechanism comprisingna 1W plurality o'tclamps, one of said clamps being. more resistant to actuation; a single-rotaryshaft providing power'tor actuatingrall of saidclamps; a clamp actuating lever opera-.1 tively connected with each of said clamps, said levers being of unequal length for api-i plying unequal forces a rightand a loft threaded screw: rotatable with said shalt; non-rotatable nuts threaded uponsald screws and adapted to be moved anally by the llll rotation of said sliatt andmeans to transi'nit to said lovers the tra-uslatory movement of said nuts to cause said levers toactuate said clamps. V

"9. A machine tool combininga support;'-

a member adapted to be translated relative to said support and to be clamped thereto; translating mechanism for-said men'iber; clamps for securing said. member to said 1 housing; a hand lever connected with said f shaft for rotating and. translating it; means actuated by rotation ot'said shaft. when in one xial position to close-said clamps; means actuated by said shaft when in another. axial position to (actuate said translating mechanism an da locking member connected with.

the controlling'means for the translating mechanism and .adapted to be clutched to 11303 translatably mounted thereon and .35 i.

said housing to prevent actuation of the translating means when the clamps are closed.

10. A radial drill combining a column; an arm translatably mounted on said column and adapted to be clamped thereto; translat-ing mechanism for said arm including a power shaft, a relatively rotatable complemental screw and nut, the former being supported by the column and the latter being carried by the arm and friction clutches between said power shaft and one of said relatively rotatable members for causing rotation in either direction; clamping means for said arm; a single lever adapter selectively to be connected with the arm translating and arm clamping means, said lever being adapted by one movement to release said clamps and by a subsequent movement gradually to selectively actuate either of said friction clutches to cause translation of said arm in either direction without shoclr.

11. A radial drill combining a column; an arm translatably mounted thereon; a shaft; a relatively rotatable screw and nut carried by said column and arm respectively and cooperating to translate the arm on the column; a reversible drive from said shaft to the rotatable one of said relatively rotatable elements including a plurality of friction clutches; means to clamp the arm to the column; a single lever for actuating said clamping means; means controlling the movement of the lever to two parallel planes and a transverse plane; means actuated by the lever when moved in one of its parallel planes to actuate said clamping means; means actuated by movement of the lever in said transverse plane operatively to connect it with said clutches; and means permitting the lever to be moved in either of two directions in a plane parallel to said first named plane selectively to engage said friction clutches to effect in'ipositive translation of said arm.

In a radial drill having a supporting column and an arm translatably mounted thereon, said arm having a sleeve surrounding "the column split at the rear thereof and also having a rearwardly extending bracket; a pair of clamping levers pivotally mounted on opposite sides of said bracket; and means for operating said levers comprising a shaft mounted for rotation in said bracket; a screw threaded member thereon adapted to rotate therewith; a pair of nuts engaging said screw threads, said levers being each adapted to be operated by one of said nuts,

and means for rotating said shaft.

13. In a radial drill having, a supporting column and an arm translatably mounted thereon said arm having a rearwardly extending bracket; means for translating said arm; means for clamping said arm to said column; and-operating means forsaid translating means and said clamping means com prising a removable casing mounted in said bracket, mechanism therein operably connected to said trans ting means and said clamping means and manually operable means therefor carried by said casing.

1%. A radial drill combining a column; an arm adjustably mounted thereon; a plurality of clamps for securing said arm in adjusted position on said column, one of said clamps offering greateresistance to clamping action; a rotary shaft mounted transversely of said column and arm; a manually operable lever connected to said shaft and movable in a substantially vertical plane to rotate said shaft; :1 pivoted actuating lever associated witheach of said clamps; means for actuating said levers by rotation of said shaft, the lever extendin to the clamp offering greater resistance being arranged to transmit a greater force thereto.

15. A radial drill combining a column; arm adjustably mounted thereon; a pair of clamps for securing toe arm to the column, one of said clamps offering greater resistance to. operation than the other; a pivoted lever connected to each of said clamps; a rotary shaft mounted transversely of the arm; a manually operable lever connected to said shaft and movable in a substantially vertical plane for rotating said shaft; and equalizing means operated by said shaft and connected to said levers for ensuring complete actuation of both said clamps, the lever extending to said clamp having the greater resistance being proportioned to transmit a greater force thereto.

16. A radial drill combining a column; an arm mounted on said column; means for translating said arm thereon; clutch means therefor; means for clamping said arm to the column; a shaft mounted for longitudinal and rotatory movement in said arm; a manually operable lever connected thereto; means for operating said clamping means by the rotation of said shaft; and means selectively engaged by axial movement of said shaft to a predetermined axial position for actuating said clutch by rotation of said shaft.

In witness whereof, I have hereunto subscribed my name.

DAVID o. KLAusi/mran 

